Gage CompuScope 14100C, Руководство по аппаратному обеспечению и инструкция по установке драйверов

Страница: 130 / 174

124 CompuScope 14100C
CompuScope 14100C triggering
CompuScope 14100C features state-of-the-art Windowed triggering. The user has the ability to set up two
independent triggers that are ORed by the on-board circuitry.
Each of the two triggers are designed to be similar to an oscilloscope, so the user can easily replace the Digital
Oscilloscope in his or her application with a CompuScope 14100C. A user can select the trigger source, trigger
level and trigger slope using software commands.
The user can software-select the trigger source from any one of the following:
•
Channel 1
•
Channel 2
•
External Trigger
•
Software Trigger
The selected trigger source is then compared to a trigger level set by an on-board, 8 bit software-controlled
DAC. An on-board, high-speed comparator is used for this function, making it possible to trigger on narrow
pulses or glitches that are much shorter than the sample rate, subject to the 30 MHz bandwidth limitation of the
front-end trigger circuitry.
Each time the selected signal crosses the trigger level, the on-board triggering circuitry monitors it for the slope
selected by the user. When the appropriate slope is detected, a Trigger signal is generated.
Figure 74: Generation of a trigger signal (negative slope)